Exhaust gas post-processing apparatus and method for sulfur oxide removal

ABSTRACT

The present disclosure relates to an apparatus and a method of post-processing exhaust gas for removing sulfur oxides, and more particularly, relates to an apparatus and a method of post-processing exhaust gas for removing sulfur oxides, in which exhaust gas is produced when fuel is combusted in a diesel internal combustion engine and the exhaust gas is purified by the apparatus for post-processing exhaust gas, and in this case, sulfur oxides (SOx) is produced and stacked in a catalytic device (diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR)) equipped in the apparatus for post-processing exhaust gas during a process of purifying the exhaust gas, and the sulfur oxides is removed.

CROSS-REFERENCE TO RELATED APPLICATION

This present application is a continuation of and claims priority ofInternational Application No. PCT/KR2014/008389, filed Sep. 5, 2014,which claims priority of Korean Application No. 10-2013-0106585, filedSep. 5, 2013, the contents of which are hereby incorporated by referencein their entireties.

FIELD OF THE DISCLOSURE

The present disclosure relates to exhaust gas post-processing forremoving sulfur oxides, and more particularly, to an apparatus and amethod of post-processing exhaust gas for removing sulfur oxides, whichare capable of removing sulfur oxides (SOx) that is produced and stackedin a catalytic device (diesel oxidation catalyst (DOC) and selectivecatalytic reduction (SCR)) equipped on the apparatus for post-processingexhaust gas during a process of purifying exhaust gas.

BACKGROUND OF THE DISCLOSURE

In general, when fuel is combusted in a diesel internal combustionengine using oil fuel, exhaust gas is produced. The exhaust gas containsa harmful material having a gas phase, such as a carbon monoxide (CO),hydrocarbon (HC), and a nitrogen oxide (NOx). As a technology forremoving the harmful material, an exhaust gas post-processing apparatusis used. A catalytic device is used in the exhaust gas post-processingapparatus. The catalytic device includes a selective catalytic reduction(SCR) device and a diesel oxidation catalyst (DOC) device.

The SCR is a technology for oxidizing a nitrogen monoxide (NO) in theexhaust gas to a nitrogen oxide (NO₂) by using a dielectric barrierdischarge (DBD), and then removing the nitrogen oxide (NO₂) by adding aurea-aqueous solution.

The DOC is a technology for oxidizing a hydrocarbon compound (HC) and acarbon monoxide (CO) in the exhaust gas to harmless water (H₂O) andcarbon dioxide (CO₂).

In the meantime, a part of an oxidation reaction generable in thecatalytic device (DOC and SRC) may produce an undesirable product, and areverse effect may be actually generated in an effect of a catalyst. Forexample, sulfur oxides may be produced and stacked on the catalyticdevice. More particularly, a sulfur dioxide (SO₂) is oxidized to asulfur trioxide (SO₃) and the sulfur trioxide (SO₃) is bonded withvapor, so that sulfuric acid (H₂SO₄) in a gas state may be produced. Thesulfuric acid vapor is bonded to other vapor to produce sulfuric acidparticles detected as particles when the exhaust of the totalparticulate matters (PM) from an engine is evaluated. The sulfur oxidesmay hinder an oxidation activity of the catalytic device. Accordingly,it is necessary to appropriately remove the sulfur oxides.

In the meantime, in the existing technology for removing sulfur oxides,it is known that when a high temperature environment of 600ccordingly,it is necessary to appropriately removeprogresses.

However, in order to create a high temperature of 600 of 600ccordingly,it is necessary to appropriately removeprogresses.ected as particleswhen the exhaust of the total particulate matters (PM) from an engine isevaluated. In the meantime, sulfur or sulfur oxides component may have adifferent adsorption and desorption characteristic with respect to acatalyst according to the kind of catalyst and the form of sulfuroxides. For example, under a specific temperature environment, aspecific sulfur oxides is removed, but sulfur oxides having anothercharacteristic may not be removed. Accordingly, a uniform regenerationand control when the catalytic device is regenerated has a limit inremoving sulfur oxides.

LITERATURE OF RELATED ART

-   Patent Literature 1: Korean Patent Application Laid-Open No.    10-2008-0021123 (Mar. 6, 2008)-   Patent Literature 2: Korean Patent Application Laid-Open No.    10-2010-0116898 (Nov. 2, 2010)-   Patent Literature 3: Korean Patent Application Laid-Open No.    10-2006-0054423 (May 22, 2006)-   Patent Literature 4: Korean Patent Application Laid-Open No.    10-2006-0002178 (Jan. 9, 2006)

The discussion above is merely provided for general backgroundinformation and is not intended to be used as an aid in determining thescope of the claimed subject matter.

SUMMARY

This summary and the abstract are provided to introduce a selection ofconcepts in a simplified form that are further described below in theDetailed Description. The summary and the abstract are not intended toidentify key features or essential features of the claimed subjectmatter.

An object of the present disclosure is to provide an apparatus forpost-processing exhaust gas for removing sulfur oxides, which is capableof removing sulfur oxides by differently controlling a regenerationcycle and a desorption condition according to the kind of sulfur orsulfur oxides adsorbed to a catalytic device when creating a hightemperature environment so that a desulfurization operation is performedby injecting fuel to the apparatus for post-processing exhaust gas.

A technical object to be achieved in the present disclosure is notlimited to the aforementioned technical objects, and anothernot-mentioned technical object will be obviously understood from thedescription below by those with ordinary skill in the art to which thepresent disclosure pertains.

In order to solve the technical problem, an exemplary embodiment of thepresent disclosure provides an apparatus for post-processing exhaust gasfor removing sulfur oxides, the apparatus including: an input unitconfigured to receive one or more elements of operation information of avehicle among an engine operation time, an engine fuel consumptionquantity, a vehicle trip distance, and sulfur oxides produced quantity;a memory unit configured to store a first operation information valuefor processing sulfur oxides and a second operation information valuefor processing sulfur oxides, wherein the first operation informationvalue and the second operation information value are generated byevaluating the operation information received from the input unit; afirst processing unit configured to determine whether the firstoperation information value stored in the memory unit reaches apredetermined first reference value, and command a low temperaturecontrol when the first operation information value reaches the firstreference value; a second processing unit configured to determinewhether the second operation information value stored in the memory unitreaches a predetermined second reference value, and command a hightemperature control when the second operation information value reachesthe predetermined second reference value; and sulfur oxides removaloperating unit configured to remove a first sulfur oxides by heating acatalytic device under a first temperature condition when the lowtemperature control command is generated from the first processing unit,and remove the first sulfur oxides and a second sulfur oxides by heatingthe catalytic device under a second temperature condition when the hightemperature control command is generated from the second processingunit.

The first processing unit may initialize the first operation informationvalue of the memory unit after the low temperature control command isgenerated, and the second processing unit may initialize the secondoperation information value of the memory unit after the hightemperature control command is generated.

When the second processing unit initializes the second operationinformation value of the memory unit, the second processing unit mayinitialize the first operation information value of the memory unittogether.

In the sulfur oxides removal operating unit, the first temperaturecondition may be 400 enerated.er and the second temperature conditionmay be 600° C. or higher.

The predetermined first reference value may be smaller than the secondreference value.

The apparatus may further include a manual control unit configured togenerate a high temperature control command, in which when the hightemperature control command is generated from the manual control unit,the first sulfur oxides and the second sulfur oxides are removed byheating the catalytic device under the second temperature condition, andthe first operation information value and the second operationinformation value of the memory unit are initialized.

The first sulfur oxides may include ammonium sulfate ((NH₄)₂SO₄), andthe second sulfur oxides may include copper sulfate (CuSO₄).

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides a method of post-processing exhaust gasfor removing sulfur oxides, the method including: an input operation ofreceiving one or more elements of operation information of a vehicleamong an engine operation time, an engine fuel consumption quantity, avehicle trip distance, and sulfur oxides produced quantity from an inputunit; an evaluating operation of generating a first operationinformation value for processing sulfur oxides and a second operationinformation value for processing sulfur oxides by evaluating theoperation information received from the input operation; a first commandoperation of determining whether the first operation information valueevaluated in the evaluating operation reaches a predetermined firstreference value, and commanding a low temperature control when the firstoperation information value reaches the predetermined first referencevalue; a second command operation of determining whether the secondoperation information value evaluated in the evaluating operationreaches a predetermined second reference value, and commanding a hightemperature control when the second operation information value reachesthe predetermined second reference value; a first removal operation ofremoving a first sulfur oxides by heating a catalytic device under afirst temperature condition when the low temperature control command isgenerated in the first command operation; and a second removal operationof removing the first sulfur oxides and a second sulfur oxides byheating the catalytic device under a second temperature condition when ahigh temperature control command is generated in the second commandoperation.

The method may further include: initializing the first operationinformation value after the low temperature control command isgenerated; and initializing the second operation information value afterthe high temperature control command is generated.

When the second operation information value is initialized, the firstoperation information value may be initialized together.

When the received operation information is the engine operation time,the second reference value may be set to a range from 1.5 times to 20times the first reference value.

When the received operation information is the engine fuel consumptionquantity, the second reference value may be set to a range from 1.5times to 10 times the first reference value.

When the received operation information is the vehicle trip distance,the second reference value may be set to a range from 1.5 times to 5times the first reference value.

When the received operation information is the sulfur oxides producedquantity, the first reference value may be sulfur oxides storagequantity of a DOC or a first sulfur oxides storage quantity, and thesecond reference value may be a second sulfur oxides storage quantity.

The first temperature condition may be 400 value may be a second nce,the second reference value may be set to a ranThe predetermined firstreference value may be smaller than the second reference value.

A manual control unit generating a high temperature control command maybe further included, and the method may further include when the hightemperature control command is generated from the manual control unit,removing the first sulfur oxides and the second sulfur oxides by heatingthe catalytic device under the second temperature condition, andinitializing the first operation information value and the secondoperation information value.

The first sulfur oxides may include ammonium sulfate ((NH₄)₂SO₄), andthe second sulfur oxides may include copper sulfate (CuSO₄).

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, evaluate the information on the engine operationtime 110, determine whether the evaluated value reaches the short timereference value 214, and generate a low temperature control command whenthe evaluated value reaches the short time reference value 214; and asecond time processing unit 216 configured to evaluate the informationon the engine operation time 110, determine whether the evaluated valuereaches the long time reference value 218, and generate a hightemperature control command when the evaluated value reaches the longtime reference value 218, in which when the low temperature controlcommand is generated, the apparatus performs an operation of removingthe sulfur oxides at a relatively low temperature compared to the hightemperature control command and initializes the information on theengine operation time 110 evaluated in the first time processing unit212, and when the high temperature control command is generated, theapparatus performs an operation of removing the sulfur oxides at arelatively high temperature compared to the low temperature controlcommand and initializes the information on the engine operation time 110evaluated in the second time processing unit 216.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first fuelquantity processing unit 222 configured to receive information on anengine fuel consumption quantity 120 about a degree of fuel consumed byan engine, be set with a small quantity reference value 224 and a largequantity reference value 228, evaluate the information on the enginefuel consumption quantity 120, determine whether the evaluated valuereaches the small quantity reference value 224, and generate a lowtemperature control command when the evaluated value reaches the smallquantity reference value 224; and a second fuel quantity processing unit226 configured to evaluate the information on the engine fuelconsumption quantity 120, determine whether the evaluated value reachesthe large quantity reference value 228, and generate a high temperaturecontrol command when the evaluated value reaches the large quantityreference value 228, in which when the low temperature control commandis generated, the apparatus performs an operation of removing the sulfuroxides at a relatively low temperature compared to the high temperaturecontrol command and initializes the information on the engine fuelconsumption quantity 120 evaluated in the first fuel quantity processingunit 222, and when the high temperature control command is generated,the apparatus performs an operation of removing the sulfur oxides at arelatively high temperature compared to the low temperature controlcommand and initializes the information on the engine fuel consumptionquantity 120 evaluated in the second fuel quantity processing unit 226.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a firstdistance processing unit 232 configured to receive information on avehicle trip distance 130 about a degree of a trip distance of avehicle, be set with a short distance reference value 234 and a longdistance reference value 238, evaluate the information on the vehicletrip distance 130, determine whether the evaluated value reaches theshort distance reference value 234, and generate a low temperaturecontrol command when the evaluated value reaches the short distancereference value 234; and a second distance processing unit 236configured to evaluate the information on the vehicle trip distance 130,determine whether the evaluated value reaches the long distancereference value 238, and generate a high temperature control commandwhen the evaluated value reaches the long distance reference value 238,in which when the low temperature control command is generated, theapparatus performs an operation of removing the sulfur oxides at arelatively low temperature compared to the high temperature controlcommand and initializes the information on the vehicle trip distance 130evaluated in the first distance processing unit 232, and when the hightemperature control command is generated, the apparatus performs anoperation of removing the sulfur oxides at a relatively high temperaturecompared to the low temperature control command and initializes theinformation on the vehicle trip distance 130 evaluated in the seconddistance processing unit 236.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a DOC sulfuroxides storage quantity calculating unit 252 configured to be set withsulfur oxides quantity reference value 256 and first and second sulfuroxides quantity reference values 266 a and 266 b, receive information onsulfur oxides produced quantity 140 about a degree of quantity of sulfuroxides produced, receive a DOC inlet exhaust gas temperature 142, andcalculate a storage quantity of sulfur oxides produced in a DOC; sulfuroxides quantity processing unit 258 configured to evaluate the storagequantity of sulfur oxides, determine whether the evaluated storagequantity of sulfur oxides reaches the sulfur oxides quantity referencevalue 256, and generate a low temperature control command when thestorage quantity of sulfur oxides reaches the sulfur oxides quantityreference value 256; a first sulfur oxides storage quantity processingunit 266 a configured to receive the information on the sulfur oxidesproduced quantity 140, receive the storage quantity of sulfur oxides,receive an SCR inlet exhaust gas temperature 144, and calculate astorage quantity of a first sulfur oxides produced in an SCR; a firstsulfur oxides quantity processing unit 268 a configured to evaluate thestorage quantity of the first sulfur oxides, determine whether theevaluated storage quantity of the first sulfur oxides reaches the firstsulfur oxides quantity reference value 266 a, and generate a lowtemperature control command when the evaluated storage quantity of thefirst sulfur oxides reaches the first sulfur oxides quantity referencevalue 266 a; a second sulfur oxides storage quantity processing unit 266b configured to receive information on the sulfur oxides producedquantity 140, receive the storage quantity of sulfur oxides, receive theSCR inlet exhaust gas temperature 144, and calculate a storage quantityof a second sulfur oxides produced in the SCR; and a second sulfuroxides quantity processing unit 268 b configured to evaluate the storagequantity of the second sulfur oxides, determine whether the evaluatedstorage quantity of the second sulfur oxides reaches the second sulfuroxides quantity reference value 266 b, and generate a high temperaturecontrol command when the evaluated storage quantity of the second sulfuroxides reaches the second sulfur oxides quantity reference value 266 b,in which when the low temperature control command is generated, theapparatus performs an operation of removing the sulfur oxides at arelatively low temperature compared to the high temperature controlcommand and initializes the information on the sulfur oxides producedquantity 140 evaluated in each of the sulfur oxides quantity processingunit 258 and the first sulfur oxides quantity processing unit 268 a, andwhen the high temperature control command is generated, the apparatusperforms an operation of removing the sulfur oxides at a relatively hightemperature compared to the low temperature control command andinitializes the information on the sulfur oxides produced quantity 140evaluated in the second sulfur oxides quantity processing unit 268 b.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time, for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, receive information on an engine fuel consumptionquantity 120 about a degree of fuel consumed by the engine, be set witha small quantity reference value 224 and a large quantity referencevalue 228, evaluate the information on the engine operation time 110,determine whether the evaluated value reaches the short time referencevalue 214, and generate a low temperature control command when theevaluated value reaches the short time reference value 214; a secondtime processing unit 216 configured to evaluate the information on theengine operation time 110, determine whether the evaluated value reachesthe long time reference value 218, and generate a high temperaturecontrol command when the evaluated value reaches the long time referencevalue 218; a first fuel quantity processing unit 222 configured toevaluate the information on the engine fuel consumption quantity 120,determine whether the evaluated value reaches the small quantityreference value 224, and generate the low temperature control commandwhen the evaluated value reaches the small quantity reference value 224;and a second fuel quantity processing unit 226 configured to evaluatethe information on the engine fuel consumption quantity 120, determinewhether the evaluated value reaches the large quantity reference value228, and generate the high temperature control command when theevaluated value reaches the large quantity reference value 228, in whichwhen the low temperature control command is generated, the apparatusperforms an operation of removing the sulfur oxides at a relatively lowtemperature compared to the high temperature control command andinitializes the information on the engine operation time 110 evaluatedin the first time processing unit 212 and the information on the enginefuel consumption quantity 120 evaluated in the first fuel quantityprocessing unit 222, and when the high temperature control command isgenerated, the apparatus performs an operation of removing the sulfuroxides at a relatively high temperature compared to the low temperaturecontrol command and initializes the information on the engine operationtime 110 evaluated in the second time processing unit 216 and theinformation on the engine fuel consumption quantity 120 evaluated in thesecond fuel quantity processing unit 226.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time, for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, receive information on a vehicle trip distance 130about a degree of a trip distance of a vehicle, be set with a shortdistance reference value 234 and a long distance reference value 238,evaluate the information on the engine operation time 110, determinewhether the evaluated value reaches the short time reference value 214,and generate a low temperature control command when the evaluated valuereaches the short time reference value 214; a second time processingunit 216 configured to evaluate the information on the engine operationtime 110, determine whether the evaluated value reaches the long timereference value 218, and generate a high temperature control commandwhen the evaluated value reaches the long time reference value 218; afirst distance processing unit 232 configured to evaluate theinformation on the vehicle trip distance 130, determine whether theevaluated value reaches the short distance reference value 234, andgenerate a low temperature control command when the evaluated valuereaches the short distance reference value 234; and a second distanceprocessing unit 236 configured to evaluate the information on thevehicle trip distance 130, determine whether the evaluated value reachesthe long distance reference value 238, and generate a high temperaturecontrol command when the evaluated value reaches the long distancereference value 238, in which when the low temperature control commandis generated, the apparatus performs an operation of removing the sulfuroxides at a relatively low temperature compared to the high temperaturecontrol command and initializes the information on the engine operationtime 110 evaluated in the first time processing unit 212 and theinformation on the vehicle trip distance 130 evaluated in the firstdistance processing unit 232, and when the high temperature controlcommand is generated, the apparatus performs an operation of removingthe sulfur oxides at a relatively high temperature compared to the lowtemperature control command and initializes the information on theengine operation time 110 evaluated in the second time processing unit216 and the information on the vehicle trip distance 130 evaluated inthe second distance processing unit 236.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, set with sulfur oxides quantity reference value 256and first and second sulfur oxides quantity reference values 266 a and266 b, evaluate the information on the engine operation time 110,determine whether the evaluated value reaches the short time referencevalue 214, and generate a low temperature control command when theevaluated value reaches the short time reference value 214; a secondtime processing unit 216 configured to evaluate the information on theengine operation time 110, determine whether the evaluated value reachesthe long time reference value 218, and generate a high temperaturecontrol command when the evaluated value reaches the long time referencevalue 218; a DOC sulfur oxides storage quantity calculating unit 252configured to receive information on sulfur oxides produced quantity 140about a degree of quantity of sulfur oxides produced, receive a DOCinlet exhaust gas temperature 142, and calculate a storage quantity ofsulfur oxides produced in a DOC; sulfur oxides quantity processing unit258 configured to evaluate the storage quantity of sulfur oxides,determine whether the evaluated storage quantity of sulfur oxidesreaches the sulfur oxides quantity reference value 256, and generate alow temperature control command when the storage quantity of sulfuroxides reaches the sulfur oxides quantity reference value 256; a firstsulfur oxides storage quantity processing unit 266 a configured toreceive the information on the sulfur oxides produced quantity 140,receive the storage quantity of sulfur oxides, receive an SCR inletexhaust gas temperature 144, and calculate a storage quantity of a firstsulfur oxides produced in an SCR; a first sulfur oxides quantityprocessing unit 268 a configured to evaluate the storage quantity of thefirst sulfur oxides, determine whether the evaluated storage quantity ofthe first sulfur oxides reaches the first sulfur oxides quantityreference value 266 a, and generate a low temperature control commandwhen the evaluated storage quantity of the first sulfur oxides reachesthe first sulfur oxides quantity reference value 266 a; a second sulfuroxides storage quantity processing unit 266 b configured to receiveinformation on the sulfur oxides produced quantity 140, receive thestorage quantity of sulfur oxides, receive the SCR inlet exhaust gastemperature 144, and calculate a storage quantity of a second sulfuroxides produced in the SCR; and a second sulfur oxides quantityprocessing unit 268 b configured to evaluate the storage quantity of thesecond sulfur oxides, determine whether the evaluated storage quantityof the second sulfur oxides reaches the second sulfur oxides quantityreference value 266 b, and generate a high temperature control commandwhen the evaluated storage quantity of the second sulfur oxides reachesthe second sulfur oxides quantity reference value 266 b, in which whenthe low temperature control command is generated, the apparatus performsan operation of removing the sulfur oxides at a relatively lowtemperature compared to the high temperature control command andinitializes the information on the engine operation time 110 evaluatedin the first time processing unit 212, and the information on the sulfuroxides produced quantity 140 evaluated in each of the sulfur oxidesquantity processing unit 258 and the first sulfur oxides quantityprocessing unit 268 a, and, when the high temperature control command isgenerated, the apparatus performs an operation of removing the sulfuroxides at a relatively high temperature compared to the low temperaturecontrol command and initializes the information on the engine operationtime 110 evaluated in the second time processing unit 216, and theinformation on the sulfur oxides produced quantity 140 evaluated in thesecond sulfur oxides quantity processing unit 268 b.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time, for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, receive information on an engine fuel consumptionquantity 120 about a degree of fuel consumed by the engine, be set witha small quantity reference value 224 and a large quantity referencevalue 228, receive information on a vehicle trip distance 130 about adegree of a trip distance of a vehicle, be set with a short distancereference value 234 and a long distance reference value 238, evaluatethe information on the engine operation time 110, determine whether theevaluated value reaches the short time reference value 214, and generatea low temperature control command when the evaluated value reaches theshort time reference value 214; a second time processing unit 216configured to evaluate the information on the engine operation time 110,determine whether the evaluated value reaches the long time referencevalue 218, and generate a high temperature control command when theevaluated value reaches the long time reference value 218; a first fuelquantity processing unit 222 configured to evaluate the information onthe engine fuel consumption quantity 120, determine whether theevaluated value reaches the small quantity reference value 224, andgenerate a low temperature control command when the evaluated valuereaches the small quantity reference value 224; a second fuel quantityprocessing unit 226 configured to evaluate the information on the enginefuel consumption quantity 120, determine whether the evaluated valuereaches the large quantity reference value 228, and generate a hightemperature control command when the evaluated value reaches the largequantity reference value 228; a first distance processing unit 232configured to evaluate the information on the vehicle trip distance 130,determine whether the evaluated value reaches the short distancereference value 234, and generate the low temperature control commandwhen the evaluated value reaches the short distance reference value 234;and a second distance processing unit 236 configured to evaluate theinformation on the vehicle trip distance 130, determine whether theevaluated value reaches the long distance reference value 238, andgenerate the high temperature control command when the evaluated valuereaches the long distance reference value 238, in which when the lowtemperature control command is generated, the apparatus performs anoperation of removing the sulfur oxides at a relatively low temperaturecompared to the high temperature control command and initializes theinformation on the engine operation time 110 evaluated in the first timeprocessing unit 212, the information on the engine fuel consumptionquantity 120 evaluated in the first fuel quantity processing unit 222,and the information on the vehicle trip distance 130 evaluated in thefirst distance processing unit 232, and when the high temperaturecontrol command is generated, the apparatus performs an operation ofremoving the sulfur oxides at a relatively high temperature compared tothe low temperature control command and initializes the information onthe engine operation time 110 evaluated in the second time processingunit 216, the information on the engine fuel consumption quantity 120evaluated in the second fuel quantity processing unit 226, and theinformation on the vehicle trip distance 130 evaluated in the seconddistance processing unit 236.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time, for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, receive information on an engine fuel consumptionquantity 120 about a degree of fuel consumed by the engine, be set witha small quantity reference value 224 and a large quantity referencevalue 228, be set with sulfur oxides quantity reference value 256 andfirst and second sulfur oxides quantity reference values 266 a and 266b, evaluate the information on the engine operation time 110, determinewhether the evaluated value reaches the short time reference value 214,and generate a low temperature control command when the evaluated valuereaches the short time reference value 214; a second time processingunit 216 configured to evaluate the information on the engine operationtime 110, determine whether the evaluated value reaches the long timereference value 218, and generate a high temperature control commandwhen the evaluated value reaches the long time reference value 218; afirst fuel quantity processing unit 222 configured to evaluate theinformation on the engine fuel consumption quantity 120, determinewhether the evaluated value reaches the small quantity reference value224, and generate the low temperature control command when the evaluatedvalue reaches the small quantity reference value 224; a second fuelquantity processing unit 222 configured to evaluate the information onthe engine fuel consumption quantity 120, determine whether theevaluated value reaches the large quantity reference value 228, andgenerate the high temperature control command when the evaluated valuereaches the large quantity reference value 228; a DOC sulfur oxidesstorage quantity calculating unit 252 configured to receive informationon sulfur oxides produced quantity 140 about a degree of quantity ofsulfur oxides produced, receive a DOC inlet exhaust gas temperature 142,and calculate a storage quantity of sulfur oxides produced in a DOC;sulfur oxides quantity processing unit 258 configured to evaluate thestorage quantity of sulfur oxides, determine whether the evaluatedstorage quantity of sulfur oxides reaches the sulfur oxides quantityreference value 256, and generate the low temperature control commandwhen the storage quantity of sulfur oxides reaches the sulfur oxidesquantity reference value 256; a first sulfur oxides storage quantityprocessing unit 266 a configured to receive the information on thesulfur oxides produced quantity 140, receive the storage quantity ofsulfur oxides, receive an SCR inlet exhaust gas temperature 144, andcalculate a storage quantity of a first sulfur oxides produced in anSCR; a first sulfur oxides quantity processing unit 268 a configured toevaluate the storage quantity of the first sulfur oxides, determinewhether the evaluated storage quantity of the first sulfur oxidesreaches the first sulfur oxides quantity reference value 266 a, andgenerate the low temperature control command when the evaluated storagequantity of the first sulfur oxides reaches the first sulfur oxidesquantity reference value 266 a; a second sulfur oxides storage quantityprocessing unit 266 b configured to receive the information on thesulfur oxides produced quantity 140, receive the storage quantity ofsulfur oxides, receive the SCR inlet exhaust gas temperature 144, andcalculate a storage quantity of a second sulfur oxides produced in theSCR; and a second sulfur oxides quantity processing unit 268 bconfigured to evaluate the storage quantity of the second sulfur oxides,determine whether the evaluated storage quantity of the second sulfuroxides reaches the second sulfur oxides quantity reference value 266 b,and generate the high temperature control command when the evaluatedstorage quantity of the second sulfur oxides reaches the second sulfuroxides quantity reference value 266 b, in which when the low temperaturecontrol command is generated, the apparatus performs an operation ofremoving the sulfur oxides at a relatively low temperature compared tothe high temperature control command, and initializes the information onthe engine operation time 110 evaluated in the first time processingunit 212 and the information on the engine fuel consumption quantity 120evaluated in the first fuel quantity processing unit 222 and initializesthe information on the sulfur oxides produced quantity 140 evaluated ineach of the sulfur oxides quantity processing unit 258 and the firstsulfur oxides quantity processing unit 268 a, and when the hightemperature control command is generated, the apparatus performs anoperation of removing the sulfur oxides at a relatively high temperaturecompared to the low temperature control command, and initializes theinformation on the engine operation time 110 evaluated in the secondtime processing unit 216 and the information on the engine fuelconsumption quantity 120 evaluated in the second fuel quantityprocessing unit 226 and initializes the information on the sulfur oxidesproduced quantity 140 evaluated in the second sulfur oxides quantityprocessing unit 268 b.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time, for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, receive information on a vehicle trip distance 130about a degree of a trip distance of a vehicle, be set with a shortdistance reference value 234 and a long distance reference value 238, beset with sulfur oxides quantity reference value 256 and first and secondsulfur oxides quantity reference values 266 a and 266 b, evaluate theinformation on the engine operation time 110, determine whether theevaluated value reaches the short time reference value 214, and generatea low temperature control command when the evaluated value reaches theshort time reference value 214; a second time processing unit 216configured to evaluate the information on the engine operation time 110,determine whether the evaluated value reaches the long time referencevalue 218, and generate a high temperature control command when theevaluated value reaches the long time reference value 218; a firstdistance processing unit 232 configured to evaluate the information onthe vehicle trip distance 130, determine whether the evaluated valuereaches the short distance reference value 234, and generate the lowtemperature control command when the evaluated value reaches the shortdistance reference value 234; a second distance processing unit 236configured to evaluate the information on the vehicle trip distance 130,determine whether the evaluated value reaches the long distancereference value 238, and generate the high temperature control commandwhen the evaluated value reaches the long distance reference value 238;a DOC sulfur oxides storage quantity calculating unit 252 configured toreceive information on sulfur oxides produced quantity 140 about adegree of quantity of sulfur oxides produced, receive a DOC inletexhaust gas temperature 142, and calculate a storage quantity of sulfuroxides produced in a DOC; sulfur oxides quantity processing unit 258configured to evaluate the storage quantity of sulfur oxides, determinewhether the evaluated storage quantity of sulfur oxides reaches thesulfur oxides quantity reference value 256, and generate the lowtemperature control command when the storage quantity of sulfur oxidesreaches the sulfur oxides quantity reference value 256; a first sulfuroxides storage quantity processing unit 266 a configured to receive theinformation on the sulfur oxides produced quantity 140, receive thestorage quantity of sulfur oxides, receive an SCR inlet exhaust gastemperature 144, and calculate a storage quantity of a first sulfuroxides produced in an SCR; a first sulfur oxides quantity processingunit 268 a configured to evaluate the storage quantity of the firstsulfur oxides, determine whether the evaluated storage quantity of thefirst sulfur oxides reaches the first sulfur oxides quantity referencevalue 266 a, and generate the low temperature control command when theevaluated storage quantity of the first sulfur oxides reaches the firstsulfur oxides quantity reference value 266 a; a second sulfur oxidesstorage quantity processing unit 266 b configured to receive theinformation on the sulfur oxides produced quantity 140, receive thestorage quantity of sulfur oxides, receive the SCR inlet exhaust gastemperature 144, and calculate a storage quantity of a second sulfuroxides produced in the SCR; and a second sulfur oxides quantityprocessing unit 268 b configured to evaluate the storage quantity of thesecond sulfur oxides, determine whether the evaluated storage quantityof the second sulfur oxides reaches the second sulfur oxides quantityreference value 266 b, and generate the high temperature control commandwhen the evaluated storage quantity of the second sulfur oxides reachesthe second sulfur oxides quantity reference value 266 b, in which whenthe low temperature control command is generated, the apparatus performsan operation of removing the sulfur oxides at a relatively lowtemperature compared to the high temperature control command, andinitializes the information on the engine operation time 110 evaluatedin the first time processing unit 212 and the information on the vehicletrip distance 130 evaluated in the first distance processing unit 232and initializes the information on the sulfur oxides produced quantity140 evaluated in each of the sulfur oxides quantity processing unit 258and the first sulfur oxides quantity processing unit 268 a, and when thehigh temperature control command is generated, the apparatus performs anoperation of removing the sulfur oxides at a relatively high temperaturecompared to the low temperature control command, and initializes theinformation on the engine operation time 110 evaluated in the secondtime processing unit 216 and the information on the vehicle tripdistance 130 evaluated in the second distance processing unit 236 andinitializes the information on the sulfur oxides produced quantity 140evaluated in the second sulfur oxides quantity processing unit 268 b.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first timeprocessing unit 212 configured to receive information on an engineoperation time 110 about a degree of time, for which an engine isoperated, be set with a short time reference value 214 and a long timereference value 218, receive information on an engine fuel consumptionquantity 120 about a degree of fuel consumed by the engine, be set witha small quantity reference value 224 and a large quantity referencevalue 228, receive information on a vehicle trip distance 130 about adegree of a trip distance of the vehicle, be set with a short distancereference value 234 and a long distance reference value 238, be set withsulfur oxides quantity reference value 256 and first and second sulfuroxides quantity reference values 266 a and 266 b, evaluate theinformation on the engine operation time 110, determine whether theevaluated value reaches the short time reference value 214, and generatea low temperature control command when the evaluated value reaches theshort time reference value 214; a second time processing unit 216configured to evaluate the information on the engine operation time 110,determine whether the evaluated value reaches the long time referencevalue 218, and generate a high temperature control command when theevaluated value reaches the long time reference value 218; a first fuelquantity processing unit 222 configured to evaluate the information onthe engine fuel consumption quantity 120, determine whether theevaluated value reaches the small quantity reference value 224, andgenerate the low temperature control command when the evaluated valuereaches the small quantity reference value 224; a second fuel quantityprocessing unit 226 configured to evaluate the information on the enginefuel consumption quantity 120, determine whether the evaluated valuereaches the large quantity reference value 224, and generate the hightemperature control command when the evaluated value reaches the largequantity reference value 228; a first distance processing unit 236configured to evaluate the information on the vehicle trip distance 130,determine whether the evaluated value reaches the short distancereference value 234, and generate the low temperature control commandwhen the evaluated value reaches the short distance reference value 234;a second distance processing unit 236 configured to evaluate theinformation on the vehicle trip distance 130, determine whether theevaluated value reaches the long distance reference value 238, andgenerate the high temperature control command when the evaluated valuereaches the long distance reference value 238; a DOC sulfur oxidesstorage quantity calculating unit 252 configured to receive informationon sulfur oxides produced quantity 140 about a degree of quantity ofsulfur oxides produced, receive a DOC inlet exhaust gas temperature 142,and calculate a storage quantity of sulfur oxides produced in a DOC;sulfur oxides quantity processing unit 258 configured to evaluate thestorage quantity of sulfur oxides, determine whether the evaluatedstorage quantity of sulfur oxides reaches the sulfur oxides quantityreference value 256, and generate the low temperature control commandwhen the storage quantity of sulfur oxides reaches the sulfur oxidesquantity reference value 256; a first sulfur oxides storage quantityprocessing unit 266 a configured to receive the information on thesulfur oxides produced quantity 140, receive the storage quantity ofsulfur oxides, receive an SCR inlet exhaust gas temperature 144, andcalculate a storage quantity of a first sulfur oxides produced in anSCR; a first sulfur oxides quantity processing unit 268 a configured toevaluate the storage quantity of the first sulfur oxides, determinewhether the evaluated storage quantity of the first sulfur oxidesreaches the first sulfur oxides quantity reference value 266 a, andgenerate the low temperature control command when the evaluated storagequantity of the first sulfur oxides reaches the first sulfur oxidesquantity reference value 266 a; a second sulfur oxides storage quantityprocessing unit 266 b configured to receive information on the sulfuroxides produced quantity 140, receive the storage quantity of sulfuroxides, receive the SCR inlet exhaust gas temperature 144, and calculatea storage quantity of a second sulfur oxides produced in the SCR; and asecond sulfur oxides quantity processing unit 268 b configured toevaluate the storage quantity of the second sulfur oxides, determinewhether the evaluated storage quantity of the second sulfur oxidesreaches the second sulfur oxides quantity reference value 266 b, andgenerate the high temperature control command when the evaluated storagequantity of the second sulfur oxides reaches the second sulfur oxidesquantity reference value 266 b, in which when the low temperaturecontrol command is generated, the apparatus performs an operation ofremoving the sulfur oxides at a relatively low temperature compared tothe high temperature control command, and initializes the information onthe engine operation time 110 evaluated in the first time processingunit 212, the information on the engine fuel consumption quantity 120evaluated in the first fuel quantity processing unit 222, and theinformation on the vehicle trip distance 130 evaluated in the firstdistance processing unit 232 and initializes the information on thesulfur oxides produced quantity 140 evaluated in each of the sulfuroxides quantity processing unit 258 and the first sulfur oxides quantityprocessing unit 268 a, and when the high temperature control command isgenerated, the apparatus performs an operation of removing the sulfuroxides at a relatively high temperature compared to the low temperaturecontrol command, and initializes the information on the engine operationtime 110 evaluated in the second time processing unit 216, theinformation on the engine fuel consumption quantity 120 evaluated in thesecond fuel quantity processing unit 226, and the information on thevehicle trip distance 130 evaluated in the second distance processingunit 236 and initializes the information on the sulfur oxides producedquantity 140 evaluated in the second sulfur oxides quantity processingunit 268 b.

In order to solve the technical problem, another exemplary embodiment ofthe present disclosure provides an apparatus for post-processing exhaustgas for removing sulfur oxides, the apparatus including: a first fuelquantity processing unit 222 configured to information on an engine fuelconsumption quantity 120 about an amount of fuel consumed by the engine,be set with a small quantity reference value 224 and a large quantityreference value 228, receive information on a vehicle trip distance 130about a degree of a trip distance of a vehicle, be set with a shortdistance reference value 234 and a long distance reference value 238,evaluate the information on the engine fuel consumption quantity 120,determine whether the evaluated value reaches the small quantityreference value 224, and generate a low temperature control command whenthe evaluated value reaches the small quantity reference value 224; asecond fuel quantity processing unit 226 configured to evaluate theinformation on the engine fuel consumption 120, determine whether theevaluated value reaches the large quantity reference value 228, andgenerate a high temperature control command when the evaluated valuereaches the large quantity reference value 228; a first distanceprocessing unit 232 configured to evaluate the information on thevehicle trip distance 130, determine whether the evaluated value reachesthe short distance reference value 234, and generate the low temperaturecontrol command when the evaluated value reaches the short distancereference value 234; and a second distance processing unit 236configured to evaluate the information on the vehicle trip distance 130,determine whether the evaluated value reaches the long distancereference value 238, and generate the high temperature control commandwhen the evaluated value reaches the long distance reference value 238,in which when the low temperature control command is generated, theapparatus performs an operation of removing the sulfur oxides at arelatively low temperature compared to the high temperature controlcommand, and initializes the information on the engine fuel consumptionquantity 120 evaluated in the first fuel quantity processing unit 222and the information on the vehicle trip distance 130 evaluated in thefirst distance processing unit 232, and when the high temperaturecontrol command is generated, the apparatus performs an operation ofremoving the sulfur oxides at a relatively high temperature compared tothe low temperature control command, and initializes the information onthe engine fuel consumption quantity 120 evaluated in the second fuelquantity processing unit 226 and the information on the vehicle tripdistance 130 evaluated in the second distance processing unit 236.

When the second time processing unit 216 is initialized, the first timeprocessing unit 212 may be initialized together.

The long time reference value 218 may be set to 1.5 times to 20 timesthe short time reference value 214.

When the second fuel quantity processing unit 226 is initialized, thefirst fuel quantity processing unit 222 may be initialized together.

The large quantity reference value 228 may be set to 1.5 times to 10times the small quantity reference value 224.

When the second distance processing unit 236 is initialized, the firstdistance processing unit 232 may be initialized together.

The long distance reference value 238 may be set to 1.5 times to 5 timesthe short distance reference value 234.

When the second sulfur oxides quantity processing unit 268 b isinitialized, the sulfur oxides quantity processing unit 258 and thefirst sulfur oxides quantity processing unit 268 a may be initializedtogether.

A temperature implemented when the operation of removing the sulfuroxides is performed by the low temperature control command may be 400 to5 times the short distance reference value 234.alized together.emovingthe sulfur oxides is performed by the high temperature control commandmay be 600nd may be 600The apparatus may set an effective temperaturewhen an actually implemented temperature is higher than a predeterminedtemperature after the low temperature control command or the hightemperature control command is generated, and may further include sulfuroxides removal evaluating unit 410 configured to evaluate a time duringthe implementation of the effective temperature, and determine that theoperation of removing the sulfur oxides is successful when the evaluatedtime is longer than a predetermined effective time.

The effective time may be 5 minutes to 30 minutes.

The method may further include a monitoring unit 420 configured to stopthe operation of removing the sulfur oxides when the operation ofremoving the sulfur oxides is not properly performed after the lowtemperature control command or the high temperature control command isgenerated, and display a message through which a user may visually oraudibly recognize a failure of the operation of removing the sulfuroxides.

The method may further include a manual control unit 270 configured tomake the user manually initiate the operation of removing the sulfuroxides when the operation of removing the sulfur oxides is failed.

Other detailed matters of the exemplary embodiments are included in thedetailed description and the drawings.

The sulfur oxides caused from the fuel and the engine oil is adsorbed toa catalyst in the form of sulfur oxides to degrade performance, and hasa characteristic in that an adsorption rate of the sulfur oxides to thecatalyst is different according to the kind of catalyst and the form ofsulfur oxides. Accordingly, the apparatus and the method ofpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present invention may separate andcontrol a regeneration cycle and a regeneration temperature of theapparatus for post-processing exhaust gas even though the sulfur oxideshas a different characteristic according to the form of sulfur oxides,thereby removing most of the sulfur oxides.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph for describing an adsorption and desorptioncharacteristic of sulfur oxides according to a catalyst.

FIG. 2 is a diagram for describing an apparatus for post-processingexhaust gas for removing sulfur oxides according to an exemplaryembodiment of the present disclosure.

FIG. 3 is a diagram for describing an example, in which a regenerationcycle and a regeneration temperature of a catalytic device are set basedon information on an engine operation time in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

FIG. 4 is a diagram for describing an example, in which a regenerationcycle and a regeneration temperature of a catalytic device are set basedon information on an engine fuel consumption quantity in the apparatusfor post-processing exhaust gas for removing the sulfur oxides accordingto the exemplary embodiment of the present disclosure.

FIG. 5 is a diagram for describing an example, in which a regenerationcycle and a regeneration temperature of a catalytic device are set basedon information on a vehicle trip distance in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

FIG. 6 is a diagram for describing an example, in which a regenerationcycle and a regeneration temperature of a catalytic device are set basedon information on sulfur oxides produced quantity in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

DESCRIPTION OF MAIN REFERENCE NUMERALS OF THE DRAWINGS

-   100: Input unit-   110: Engine operating time-   120: Engine fuel consumption quantity-   130: Vehicle trip distance-   140: Sulfur oxide produced quantity-   142: DOC inlet exhaust gas temperature information-   144: SCR inlet exhaust gas temperature information-   200: Memory unit-   210: Time calculation processing unit-   212: First time processing unit-   214: Short time reference value-   216: Second time processing unit-   218: Long time reference value-   220: Fuel quantity calculation processing unit-   222: First fuel quantity processing unit-   224: Small quantity reference value-   226: Second fuel quantity processing unit-   228: Large quantity reference value-   230: Distance calculation processing unit-   232: First distance processing unit-   234: Short distance reference value-   236: Second distance processing unit-   238: Long distance reference value-   240: Sulfur oxide quantity calculation processing unit-   250: DOC calculation processing unit-   252: DOC sulfur oxides storage quantity calculating unit-   256: Sulfur oxide quantity reference value-   258: Sulfur oxide quantity processing unit-   260: SCR calculation processing unit-   261 a, 262 a: First, second sulfur oxides adsorption characteristic-   261 b, 262 b: First, second sulfur oxides desorption characteristic-   264 a, 264 b: First, second sulfur oxides storage quantity    processing unit-   266 a, 266 b: First, second sulfur oxides storage quantity reference    value-   268 a, 268 b: First, second sulfur oxides quantity processing unit-   270: Manual control unit-   310, 320: First, second processing unit-   410: Sulfur oxide removal evaluating unit-   420: Monitoring unit-   500: Sulfur oxide removal operating unit-   510: End-   520: Exhaust gas temperature control unit-   521: Low temperature control unit-   522: High temperature control unit

DETAILED DESCRIPTION

Advantages and characteristics of the present disclosure, and a methodof achieving the advantages and characteristics will be clear withreference to an exemplary embodiment to be described in detail togetherwith the accompanying drawings.

Hereinafter, an exemplary embodiment of the present disclosure will bedescribed in detail with reference to the accompanying drawings. Itshould be appreciated that the exemplary embodiment, which will bedescribed below, is illustratively described for helping to understandthe present disclosure, and the present disclosure may be variouslymodified to be carried out differently from the exemplary embodimentdescribed herein. In the following description of the presentdisclosure, a detailed description and a detailed illustration ofpublicly known functions or constituent elements incorporated hereinwill be omitted when it is determined that the detailed description mayunnecessarily make the subject matter of the present disclosure unclear.

Further, the terms used in the description are defined considering thefunctions of the present disclosure and may vary depending on theintention or usual practice of a manufacturer. Therefore, thedefinitions should be made based on the entire contents of the presentspecification.

In the meantime, a numerical value suggested throughout thespecification is a value suggested for helping to understand theinvention, and the numerical value does not influence the scope of thepresent disclosure.

Like reference numerals indicate like elements throughout thespecification.

Hereinafter, an adsorption/desorption characteristic of sulfur oxidesaccording to sulfur oxides when an apparatus for post-processing exhaustgas performs a regeneration operation for removing sulfur oxides will bedescribed with reference to FIG. 1. FIG. 1 is a graph for describing anadsorption and desorption characteristic of sulfur oxides according to acatalyst.

As illustrated in FIG. 1, graph (a) of FIG. 1 is a graph representing ageneral situation of an adsorption/desorption characteristic of sulfuroxides. A horizontal axis means a temperature, and a left vertical axisrepresents a weight change (%) and a right vertical axis represents aconcentration of sulfur oxides.

That is, in reviewing graph (a) of FIG. 1, it can be seen that when atemperature is increased, a weight change rate is gradually decreased.This means that when a temperature is increased, sulfur oxides, which isin an adsorbed state, is desorbed in the apparatus for post-processingexhaust gas.

In the meantime, the sulfur oxides represents a high concentration at aspecific temperature. For example, the sulfur oxides represents a highconcentration in a first temperature section and a second temperaturesection. Here, the first temperature section is about 400tion is about400ond tempnd temperature section is about 600° C. to 750° C. This meansthat the sulfur oxides is more actively desorbed in a specifictemperature section.

Graphs (b) and (c) of FIG. 1 are graphs for recognizing whether aspecific compound is removed in sulfur oxides.

First, in reviewing graph (b) of FIG. 1, graph (b) represents anadsorption/desorption characteristic of a first sulfur oxides, and itcan be seen that a sulfur concentration is actively changed with a largequantity approximately in the first temperature section. That is, it maybe understood that the large quantity of the first sulfur oxides isdesorbed in the first temperature section. Here, the first sulfur oxidesis sulfur oxides of ammonium sulfate (NH₄)₂SO₄).

In the meantime, in reviewing graph (c) of FIG. 1, graph (c) representsan adsorption/desorption characteristic of a second sulfur oxides, andit can be seen that a sulfur concentration is actively changed with alarge quantity approximately in the second temperature section. That is,it may be understood that the large quantity of the second sulfur oxidesis desorbed in the second temperature section. However, it can be seenthat the quantity of sulfur oxides adsorbed and desorbed is relativelysmall compared to the first sulfur oxides. Here, the second sulfuroxides is sulfur oxides of copper sulfate (CuSO₄).

That is, when a catalytic device is uniformly regenerated in accordancewith one specific kind of temperature environment like the related art,some sulfur oxides may be removed, but the other sulfur oxides may notbe removed. Further, when the catalytic device is regenerated inaccordance with a high temperature, most of the sulfur oxides may beremoved, but in order to create a high temperature environment, there isa problem in that the large quantity of fuel is consumed.

In this respect, the present disclosure may remove sulfur oxides bydifferently setting a cycle, in which the regeneration of the apparatusfor post-processing exhaust gas is performed, and a temperatureimplemented when the reproduction is performed according to a componentof the sulfur oxides. This will be described with reference to FIG. 2.

FIG. 2 is a diagram for describing the apparatus for post-processingexhaust gas for removing sulfur oxides according to an exemplaryembodiment of the present disclosure.

Information on an engine operation time 110, an engine fuel consumptionquantity 120, a vehicle trip distance 130, and sulfur oxides producedquantity 140 may be collected, and the collected information may bestored in an input unit 100. A reproduction cycle and a temperatureenvironment of a catalytic device are set for each information. Here,the reproduction cycle and the temperature environment of the catalyticdevice may also be controlled by collecting information on any one orinformation on two or more of the engine operation time 110, the enginefuel consumption quantity 120, the vehicle trip distance 130, and thesulfur oxides produced quantity 140.

For example, a time calculation, a fuel quantity calculation, a distancecalculation, and sulfur oxides quantity calculation are performed forinformation on the engine operation time 110, the engine fuelconsumption quantity 120, the vehicle trip distance 130, and the sulfuroxides produced quantity 140, respectively, and a first processing unit310 or a second processing unit 320 sets the regeneration cycle and theregeneration temperature according to a result of each calculation.

The first processing unit 310 allows the regeneration to be performed ata relatively low temperature (T-L) compared to the second processingunit 320, and sets a short regeneration cycle (short term DeSOx).

The second processing unit 320 allows the regeneration to be performedat a relatively high temperature (T-H) compared to the first processingunit 310, and sets a long regeneration cycle (long term DeSOx).

Regeneration environment information (regeneration cycle andregeneration temperature) set by the first and second processing units310 and 320 is provided to sulfur oxides removal evaluating unit 410.

The sulfur oxides removal evaluating unit 410 will be described. In theapparatus for post-processing exhaust gas for removing the sulfur oxidesaccording to the exemplary embodiment of the present disclosure, the lowtemperature (T-L) and the high temperature (T-H) are set, butconstruction machinery (vehicle) substantially has a large loadvariation width, so that it may be substantially impossible to uniformlymaintain the temperature control, and thus a slight oscillation isinevitably generated. When the variation width is large, so that aregeneration temperature is implemented to be lower than the settemperature, the operation of removing sulfur oxides (DeSOx) may not beproperly performed. Accordingly, each of the low temperature and thehigh temperature may have a minimum effective temperature reference. Thesulfur oxides removal evaluating unit 410 evaluates time only when acurrently controlled temperature of exhaust gas (a temperature of an SCRinlet) is higher than the minimum effective temperature, and when theevaluated time is larger than a predetermined effective time, for whichthe operation of removing the sulfur oxides (DeSOx) is performed, thesulfur oxides removal evaluating unit 410 determines that the operationof removing the sulfur oxides (DeSOx) is successful and terminates toincrease the temperature of the exhaust gas. The effective time, forwhich the operation of removing the sulfur oxides (DeSOx) is performed,may be set to 5 minutes to 30 minutes.

Actually, only when the effective time taken for the operation ofremoving the sulfur oxides is longer than 5 minutes, it is determinedthat the sulfur oxides is stably removed. The effective time less than 5minutes may be understood as a time insufficient to remove the sulfuroxides. In the meantime, the effective time may be set within 30minutes. The reason is that when the effective time is excessively long,fuel is additionally and continuously injected even though the sulfuroxides is sufficiently removed, thereby causing waste of the fuel.

Then, after the sulfur oxides removal evaluating unit 410 is operated,the monitoring unit 420 is operated.

The monitoring unit 420 prevents the sulfur oxides from beingpermanently removed, and allows the operation of removing the sulfuroxides to be performed only when a specific condition is satisfied. Thespecific condition means that any one element of information or aplurality of elements of information among the four kinds of informationincluding the monitored information on the engine operation time 110,the engine fuel consumption quantity 120, the vehicle trip distance 130,and the sulfur oxides produced quantity 140 reaches a predeterminedvalue.

The monitoring unit 420 sets a comparison target value (refer to eachreference value) for each of the four elements of information, and stopsthe operation of removing the sulfur oxides and notifies a driver of afailure of the operation of removing the sulfur oxides when the sulfuroxides is not properly performed even though the specific informationexceeds a corresponding comparison target value. For example, themonitoring unit 420 displays a visually or audibly recognizable message.That is, the monitoring unit 420 may generate an alarm or output amessage capable of notifying the failure on a dashboard.

Further, as described above, when the operation of removing the sulfuroxides is failed, the apparatus may induce a user to manually performthe operation of removing the sulfur oxides according to an intention ofthe user. That is, the apparatus induces the user to operate a manualswitch disposed in a manual control unit 270 for manually performing theregeneration of the catalytic device. The manual control unit 270 is aswitch capable of manually initiating the operation of removing thesulfur oxides according to an intention of a worker.

In the meantime, there may be a case where any one condition among thefour kinds of elements of information is satisfied, and during theperformance of the regeneration of the catalytic device under any onetemperature environment between the low temperature (T-L) and the hightemperature (T-H), another condition is additionally satisfied. In thiscase, even though the later condition is satisfied, the regeneration ofthe catalytic device is already being performed, so that it is possibleto restrict the regeneration of the catalytic device from beingcontinuously and newly performed.

The restriction of the regeneration of the catalytic device from beingcontinuously performed will be additionally described. Under any onetemperature environment between the low temperature (T-L) and the hightemperature (T-H), after the regeneration operation of the catalyticdevice is finished, the apparatus may have a pause time. The pause timeis a time from the precedent regeneration operation of the catalyticdevice to a next regeneration operation of the catalytic device. Thatis, the apparatus for post-processing exhaust gas for removing thesulfur oxides according to the exemplary embodiment of the presentdisclosure may newly start the regeneration operation of the catalyticdevice after the pause time elapses. However, when the excessively highconcentration of sulfur oxides is detected by an unknown reason, theapparatus may also exceptionally perform the regeneration of thecatalytic device.

In the meantime, the regeneration environment information (theregeneration cycle and the regeneration temperature) set by the firstand second processing units 310 and 320 may pass through the sulfuroxides removal evaluating unit 410 or may be directly provided to sulfuroxides removal operating unit 500.

The sulfur oxides removal operating unit 500 gives a command toregenerate the catalytic device for substantially removing the sulfuroxides by the set regeneration environment information. When it is notnecessary to perform the operation of removing the sulfur oxides, theoperation of removing the sulfur oxides is terminated (510).

The regeneration environment information is set by the shortregeneration cycle (short term DeSOx) and the long regeneration cycle(long term DeSOx), so that a time, at which the catalytic device is tobe regenerated, is set, and when a time reaches the short regenerationcycle, the regeneration of the catalytic device is performed under thelow temperature environment. Similarly, when a time reaches the longregeneration cycle, the regeneration of the catalytic device isperformed under the high temperature environment.

An exhaust gas temperature control unit 520 performs the command givenfrom the sulfur oxides removal operating unit 500, and when theregeneration environment information contains the command containing thelow temperature information (T-L), a low temperature control unit 521performs a low temperature control so that an appropriate quantity offuel is injected so as to implement the low temperature environment whenthe regeneration of the catalytic device is performed. Similarly, whenthe regeneration environment information contains the command containingthe high temperature information (T-H), a high temperature control unit522 performs a low temperature control so that a relatively largequantity of fuel is injected so as to implement the high temperatureenvironment when the regeneration of the catalytic device is performed.

Hereinafter, an exemplary embodiment, in which the regenerationenvironment information is set by using information on the engineoperation time, will be described with reference to FIG. 3. FIG. 3 is adiagram for describing an example, in which the regeneration cycle and aregeneration temperature of the catalytic device are set based oninformation on an engine operation time in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

The engine operation time 110 is information about a time for which anengine is operated. The information on the engine operation time 110 isprovided to a time calculation processing unit 210, and the timecalculation processing unit 210 evaluates each of a short operation timeand a long operation time, and compares and determines each of theevaluated short operation time and the evaluated long operation time.More particularly, the time calculation processing unit 210 includes afirst time processing unit 212 and a second time processing unit 216. Ashort time reference value 214 is set in the first time processing unit212 and a long time reference value 218 is set in the second timeprocessing unit 216.

The long time reference value 218 may be set to a relatively longer timethan the short time reference value 214. More particularly, the longtime reference value 218 may be set to be 1.5 times to 20 times theshort time reference value 214.

In the meantime, the short time reference value 214 makes the operationof removing the sulfur oxides be performed under the low temperatureenvironment, and as illustrated in FIG. 1, the short time referencevalue 214 reflects the adsorption and the desorption of the relativelylarge quantity of sulfur oxides in the first temperature section that isthe low temperature (T-L).

Similarly, the long time reference value 218 makes the operation ofremoving the sulfur oxides be performed under the high temperatureenvironment, and as illustrated in FIG. 1, the long time reference value218 reflects the adsorption and the desorption of the relatively smallquantity of sulfur oxides in the second temperature section that is thehigh temperature (T-L). That is, the regeneration of the catalyticdevice is more frequently performed in the first temperature section, inwhich the quantity of oxide sulfur is relatively large, compared to thesecond temperature section.

On the other hand, the long time reference value 218 is set to be 1.5times or more the short time reference value 214, so that it is possibleto periodically remove the activated sulfur oxides in the secondtemperature section. To additionally describe, the relatively smallquantity of sulfur oxides is produced in the second temperature sectioncompared to the first temperature section, but when the sulfur oxides iscontinuously evaluated, the performance of the apparatus forpost-processing exhaust gas deteriorates, so that the sulfur oxidesneeds to be appropriately removed at an appropriate time.

Further, the long time reference value 218 is set to be 20 times or lessthe short time reference value 214. Accordingly, in order to implement atemperature environment of the second temperature section that is arelatively high temperature compared to the first temperature section,the fuel injection quantity is increased, but the long time referencevalue 218 is restricted to be 20 times or less the short time referencevalue 214, so that it is possible to prevent the second temperaturesection from being frequently implemented and prevent the fuel frombeing excessively wasted.

For example, when it is assumed that the short time reference value 214is set to 150 hrs and the long time reference value 218 is set to 500hrs, information on the engine operation time 110 is continuouslyevaluated in the first and second time processing units 212 and 216.Then, when the evaluated operation time information reaches 150 hrs setas the short time reference value 214, a low temperature control commandis given to the first processing unit 310. Then, the operation timeinformation is continuously evaluated, and when the evaluated operationtime information reaches 500 hrs set as the long time reference value218, a high temperature control command is given to the secondprocessing unit 320.

In the meantime, the low temperature control command may be generatedjust after the high temperature control command is generated, but inthis case, the low temperature (T-L) control command may be ignored. Thereason of ignoring the low temperature (T-L) control command is thatwhen the high temperature environment is created and the operation ofremoving the sulfur oxides is performed, the sulfur oxides, which isactivated to be adsorbed/desorbed at a relatively low temperature, isremoved together.

In the meantime, when the low temperature control command is generated,the engine operation time evaluated in the first time processing unit212 is initialized. Similarly, when the high temperature (T-H) controlcommand is generated, the engine operation time evaluated in the secondtime processing unit 216 is initialized. Further, when the engineoperation time evaluated in the second time processing unit 216 isinitialized, the engine operation time evaluated in the first timeprocessing unit 212 may be also initialized together, and the reason isthat when the high temperature environment is created and the operationof removing the sulfur oxides is performed, the sulfur oxides, which isactivated to be adsorbed/desorbed at a relatively low temperature, isremoved together, as described above.

Hereinafter, an exemplary embodiment, in which the regenerationenvironment information is set by using information on an engine fuelconsumption quantity, will be described with reference to FIG. 4. FIG. 4is a diagram for describing an example, in which a regeneration cycleand a regeneration temperature of the catalytic device are set based oninformation on an engine fuel consumption quantity in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

The engine fuel consumption quantity 120 is information on a degree offuel consumed by an engine. Information on the engine fuel consumptionquantity 120 is provided to a fuel quantity calculation processing unit220, and the fuel quantity calculation processing unit 220 evaluateseach of a small consumption quantity and a large consumption quantityand compares and determines each of the evaluated small consumptionquantity and the evaluated large consumption quantity. Moreparticularly, the fuel quantity calculation processing unit 220 includesa first fuel quantity processing unit 222 and a second fuel quantityprocessing unit 226. A small quantity reference value 224 is set in thefirst fuel quantity processing unit 222, and a large quantity referencevalue 228 is set in the second fuel quantity processing unit 226.

The large quantity reference value 228 may be set to a relatively largerquantity than the small quantity reference value 224. More particularly,the large quantity reference value 228 may be set to be 1.5 times to 10times the small quantity reference value 224.

In the meantime, the small quantity reference value 224 makes theoperation of removing the sulfur oxides be performed under the lowtemperature environment, and as illustrated in FIG. 1, the smallquantity reference value 224 reflects the adsorption and the desorptionof the relatively large quantity of sulfur oxides in the firsttemperature section that is the low temperature (T-L).

Similarly, the large quantity reference value 228 makes the operation ofremoving the sulfur oxides be performed under the high temperatureenvironment, and as illustrated in FIG. 1, the large quantity referencevalue 228 reflects the adsorption and the desorption of the relativelysmall quantity of sulfur oxides in the second temperature section thatis the high temperature (T-L). That is, the regeneration of thecatalytic device is more frequently performed in the first temperaturesection, in which the quantity of oxide sulfur is relatively large,compared to the second temperature section.

On the other hand, the large quantity reference value 228 is set to be1.5 times or more the small quantity reference value 224, so that it ispossible to periodically remove the activated sulfur oxides in thesecond temperature section. To additionally describe, the relativelysmall quantity of sulfur oxides is produced in the second temperaturesection compared to the first temperature section, but when the sulfuroxides is continuously evaluated, the performance of the apparatus forpost-processing exhaust gas deteriorates, so that the sulfur oxidesneeds to be appropriately removed at an appropriate time.

Further, the large quantity reference value 228 is set to be 10 times orless the small quantity reference value 224. Accordingly, in order toimplement a temperature environment of the second temperature sectionthat is a relatively high temperature compared to the first temperaturesection, the fuel injection quantity is increased, but the largequantity reference value 228 is restricted to be 10 times or less thesmall quantity reference value 224, so that it is possible to preventthe second temperature section from being frequently implemented andprevent the fuel from being excessively wasted.

For example, when it is assumed that the small quantity reference value224 is set to 2,000 L and the large quantity reference value 228 is setto 10,000 L, information on the engine fuel consumption quantity 120 iscontinuously evaluated in the first and second fuel quantity processingunits 222 and 226. Then, when the evaluated fuel consumption informationreaches 2,000 L set as the small quantity reference value 224, a lowtemperature control command is given to the first processing unit 310.Then, the fuel consumption information is continuously evaluated, andwhen the evaluated fuel consumption information reaches 10,000 L set asthe large quantity reference value 228, a high temperature controlcommand is given to the second processing unit 320.

In the meantime, the low temperature control command may be generatedjust after the high temperature control command is generated, but inthis case, the low temperature (T-L) control command may be ignored. Thereason of ignoring the low temperature (T-L) control command is thatwhen the high temperature environment is created and the operation ofremoving the sulfur oxides is performed, the sulfur oxides, which isactivated to be adsorbed/desorbed at a relatively low temperature, isremoved together.

On the other hand, when the low temperature control command isgenerated, the information on the engine fuel consumption quantityevaluated in the first fuel quantity processing unit 222 is initialized.Similarly, when the control command according to the high temperature(T-H) is generated, the information on the engine fuel consumptionquantity evaluated in the second fuel quantity processing unit 226 isinitialized. Further, when the engine fuel consumption quantity of thesecond fuel quantity processing unit 226 is initialized, the engine fuelconsumption quantity of first fuel quantity processing unit 222 may beinitialized together, and the reason is that when the high temperatureenvironment is created and the operation of removing the sulfur oxidesis performed, the sulfur oxides, which is activated to beadsorbed/desorbed at a relatively low temperature, is removed together,as described above.

Hereinafter, an exemplary embodiment, in which the regenerationenvironment information is set by using information on a vehicle tripdistance, will be described with reference to FIG. 5. FIG. 5 is adiagram for describing an example, in which a regeneration cycle and aregeneration temperature of the catalytic device are set based oninformation on a vehicle trip distance in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

The vehicle trip distance 130 is information on a degree of trip of avehicle. Information on the vehicle trip distance 130 is provided to adistance calculation processing unit 230, and the distance calculationprocessing unit 230 evaluates a short distance and a long distance andcompares and determines each of the evaluated short distance and theevaluated long distance. More particularly, the distance calculationprocessing unit 230 includes a first distance processing unit 232 and asecond distance processing unit 236. A short distance reference value234 is set in the first distance processing unit 232 and a long distancereference value 238 is set in the second distance processing unit 236.

The long distance reference value 238 may be set to relatively largerthan the short distance reference value 234. More particularly, the longdistance reference value 238 may be set to be 1.5 times to 5 times theshort distance reference value 234.

In the meantime, the short distance reference value 234 makes theoperation of removing the sulfur oxides be performed under the lowtemperature environment, and as illustrated in FIG. 1, the shortdistance reference value 234 reflects the adsorption and the desorptionof the relatively large quantity of sulfur oxides in the firsttemperature section that is the low temperature (T-L).

Similarly, the long distance reference value 238 makes the operation ofremoving the sulfur oxides be performed under the high temperatureenvironment, and as illustrated in FIG. 1, the long distance referencevalue 238 reflects the adsorption and the desorption of the relativelysmall quantity of sulfur oxides in the second temperature section thatis the high temperature (T-L). That is, the regeneration of thecatalytic device is more frequently performed in the first temperaturesection, in which the quantity of oxide sulfur is relatively large,compared to the second temperature section.

On the other hand, the long distance reference value 238 is set to be1.5 times or more the short distance reference value 234, so that it ispossible to periodically remove the activated sulfur oxides in thesecond temperature section. To additionally describe, the relativelysmall quantity of sulfur oxides is produced in the second temperaturesection compared to the first temperature section, but when the sulfuroxides is continuously evaluated, the performance of the apparatus forpost-processing exhaust gas deteriorates, so that the sulfur oxidesneeds to be appropriately removed at an appropriate time.

Further, the long distance reference value 238 may be set to be 5 timesor less the short distance reference value 234. Accordingly, in order toimplement a temperature environment of the second temperature sectionthat is a relatively high temperature compared to the first temperaturesection, the fuel injection quantity is increased, but the long distancereference value 238 is restricted to be 5 times or less the shortdistance reference value 234, so that it is possible to prevent thesecond temperature section from being frequently implemented and preventthe fuel from being excessively wasted.

For example, when it is assumed that the short distance reference value234 is set to 5,000 km and the long distance reference value 238 is setto 25,000 km, information on the vehicle trip distance 130 iscontinuously evaluated in the first and second distance processing units232 and 236. Then, when the evaluated trip distance information reaches5,000 km set as the short distance reference value 234, a lowtemperature control command is given to the first processing unit 310.Then, the trip distance information is continuously evaluated, and whenthe evaluated trip distance information reaches 25,000 km set as thelong distance reference value 238, a high temperature control command isgiven to the second processing unit 320.

In the meantime, the low temperature control command may be generatedjust after the high temperature control command is generated, but inthis case, the low temperature (T-L) control command may be ignored. Thereason for ignoring the low temperature control command is that when thehigh temperature environment is created and the operation of removingthe sulfur oxides is performed, the sulfur oxides, which is activated tobe adsorbed/desorbed at a relatively low temperature, is removedtogether.

In the meantime, when the low temperature control command is generated,information on an engine trip distance evaluated in the first distanceprocessing unit 232 is initialized. Similarly, when the high temperature(T-H) control command is generated, information on an engine tripdistance evaluated in the second distance processing unit 236 isinitialized. Further, when the engine trip distance amount of the seconddistance processing unit 236 is initialized, the engine trip distanceamount of the first distance processing unit 232 may also be initializedtogether, and the reason is that when the high temperature environmentis created and the operation of removing the sulfur oxides is performed,the sulfur oxides, which is activated to be adsorbed/desorbed at arelatively low temperature, is removed together, as described above.

Hereinafter, an exemplary embodiment, in which the regenerationenvironment information is set by using information on sulfur oxidesproduced quantity, will be described with reference to FIG. 6. FIG. 6 isa diagram for describing an example, in which a regeneration cycle and aregeneration temperature of the catalytic device are set based oninformation on sulfur oxides produced quantity in the apparatus forpost-processing exhaust gas for removing the sulfur oxides according tothe exemplary embodiment of the present disclosure.

The sulfur oxides produced quantity 140 is information on a degree ofquantity of sulfur oxides produced. Information on the sulfur oxidesproduced quantity 140 is provided to sulfur oxides quantity calculationprocessing unit 240, and the sulfur oxides quantity calculationprocessing unit 240 evaluates the information on the sulfur oxidesproduced quantity 140 according to the form of catalyst and compares anddetermines the evaluated information on the sulfur oxides producedquantity 140. More particularly, the sulfur oxides quantity calculationprocessing unit 240 determines a degree of sulfur oxides produced withreference to DOC inlet exhaust gas temperature information 142 and SCRinlet exhaust gas temperature information 144. Accordingly, it ispossible to more accurately recognize a degree of sulfur oxides, whichneeds to be actually removed.

The sulfur oxides quantity calculation processing unit 240 includes aDOC calculation processing unit 250 and an SCR calculation processingunit 260.

The DOC calculation processing unit 250 includes a DOC sulfur oxidesstorage quantity calculating unit 252, and sulfur oxides quantityreference value 256 is set in the DOC calculation processing unit 250.The DOC sulfur oxides storage quantity calculating unit 252 calculates adegree of sulfur oxides stored in the DOC based on the sulfur oxidesproduced quantity information collected from the sulfur oxides producedquantity 140 and the DOC inlet exhaust gas temperature information 142.That is, since the sulfur oxides may be naturally desorbed and removed,or absorbed and stored according to the DOC inlet exhaust gastemperature, the DOC inlet exhaust gas temperature information isreferred.

Then, the information on the sulfur oxides quantity calculated in theDOC calculation processing unit 250 is provided to sulfur oxidesquantity processing unit 258.

The sulfur oxides quantity provided from the DOC calculation processingunit 250 is evaluated in the sulfur oxides quantity processing unit 258,and the sulfur oxides quantity processing unit 258 compares anddetermines the evaluated sulfur oxides quantity with sulfur oxidesquantity reference value 256. When the evaluated sulfur oxides quantityreaches the sulfur oxides quantity reference value 256, the sulfuroxides quantity processing unit 258 gives the low temperature controlcommand to the first processing unit 310. Then, the information on thesulfur quantity evaluated in the sulfur oxides quantity processing unit258 is initialized after the low temperature control command isgenerated. The sulfur oxides reference value 256 may be set to, forexample, 20 g. That is, the sulfur oxides quantity processing unit 258determines whether the evaluated sulfur oxides quantity reaches 20 g,and when the evaluated sulfur oxides quantity reaches 20 g, the sulfuroxides quantity processing unit 258 initializes the information on theevaluated sulfur oxides quantity and gives the low temperature controlcommand.

When the low temperature control command is given, the information onthe sulfur oxides quantity evaluated in each of the DOC sulfur oxidesstorage quantity calculating unit 252 and the sulfur oxides quantityprocessing unit 258 is initialized.

The SCR calculation processing unit 260 calculates first and secondsulfur oxides quantities based on the sulfur oxides produced quantity140, the SCR inlet exhaust gas temperature information 144, and theinformation on the sulfur oxides quantity calculated by the DOC sulfuroxides storage quantity calculating unit 252. The SCR calculationprocessing unit 260 calculates each of the first sulfur oxides quantityand the second sulfur oxides quantity.

The first sulfur oxides quantity is calculated by collecting a firstsulfur oxides adsorption characteristic 261 a, a first sulfur oxidesdesorption characteristic 261 b, the sulfur oxides produced quantity140, the SCR inlet exhaust gas temperature information 144, and theinformation on the sulfur oxides quantity calculated by the DOC sulfuroxides storage quantity calculating unit 252. The reason is that thefirst sulfur oxides quantity is changed and stored according to atemperature environment and an originally existing first sulfur oxidesquantity.

In the meantime, a first sulfur oxides storage quantity processing unit264 a refers to a first sulfur oxides quantity reference value 266 a.The first sulfur oxides quantity reference value 266 a may be set to,for example, 25 g. That is, a first sulfur oxides quantity processingunit 268 a determines whether the evaluated first sulfur oxides quantityreaches 25 g, and when the evaluated first sulfur oxides quantityreaches 25 g, the first sulfur oxides quantity processing unit 268 ainitializes the information on the evaluated first sulfur oxidesquantity and gives the low temperature control command.

When the low temperature control command is given, the information onthe first sulfur oxides quantity evaluated in each of the first sulfuroxides storage quantity processing unit 264 a and the first sulfuroxides quantity processing unit 268 a is initialized.

Similarly, a second sulfur oxides storage quantity processing unit 264 bcalculates a second sulfur oxides quantity. The second sulfur oxidesstorage quantity processing unit 264 b calculates the second sulfuroxides quantity by collecting a second sulfur oxides adsorptioncharacteristic 262 a, a second sulfur oxides desorption characteristic262 b, the sulfur oxides produced quantity 140, the SCR inlet exhaustgas temperature information 144, and the information on the sulfuroxides quantity calculated by the DOC sulfur oxides storage quantitycalculating unit 252. The reason is that the second sulfur oxidesquantity is changed and stored according to a temperature environmentand an originally existing second sulfur oxides quantity.

In the meantime, a second sulfur oxides storage quantity processing unit264 b refers to a second sulfur oxides quantity reference value 266 b.The second sulfur oxides quantity reference value 266 b may be set to,for example, 10 g. That is, the second sulfur oxides quantity processingunit 268 b determines whether the evaluated second sulfur oxidesquantity reaches 10 g, and when the evaluated second sulfur oxidesquantity reaches 10 g, the second sulfur oxides quantity processing unit268 b initializes the information on the evaluated second sulfur oxidesquantity and gives the command according to the high temperature (T-H).

When the high temperature control command is given, the information onthe second sulfur oxides quantity evaluated in each of the second sulfuroxides storage quantity processing unit 264 b and the second sulfuroxides quantity processing unit 268 b is initialized.

In the meantime, the low temperature control command may be generatedjust after the high temperature control command is generated, but inthis case, the low temperature (T-L) control command may be ignored. Thereason of ignoring the low temperature (T-L) control command is thatwhen the high temperature environment is created and the operation ofremoving the sulfur oxides is performed, the sulfur oxides, which isactivated to be adsorbed/desorbed at a relatively low temperature, isremoved together.

On the other hand, when the control command according to the hightemperature (T-H) is generated, the information on the sulfur oxidesquantity evaluated in each of the DOC sulfur oxides storage quantitycalculating unit 252 and the sulfur oxides quantity processing unit 258is initialized, and the information on the first sulfur oxides quantityevaluated in each of the first sulfur oxides storage quantity processingunit 264 a and the first sulfur oxides quantity processing unit 268 amay be initialized together. The reason is that when the hightemperature environment is created and the operation of removing thesulfur oxides is performed, the sulfur oxides, which is activated to beadsorbed/desorbed at a relatively low temperature, is removed together.

The sulfur oxides caused from the fuel and the engine oil is adsorbed toa catalyst in the form of sulfur oxides to degrade performance, and hasa characteristic in that an adsorption rate of the sulfur oxides to thecatalyst is different according to the kind of catalyst and the form ofsulfur oxides.

Accordingly, the apparatus for post-processing exhaust gas for removingthe sulfur oxides according to the exemplary embodiment of the presentdisclosure may separate and control a regeneration cycle and aregeneration temperature of the apparatus for post-processing exhaustgas even though the sulfur oxides has a different characteristicaccording to the form of sulfur oxides, thereby removing most of thesulfur oxides.

Further, since the amount of components of the sulfur oxides removed ata high temperature is relatively smaller than the amount of componentsof the sulfur oxides removed at a low temperature, it is possible toprevent the waste of fuel consumed when removing the sulfur oxides bysetting a cycle implementing a high temperature to be long andfrequently setting a cycle implementing a low temperature.

Further, it is possible to prevent the waste of additionally consumedfuel by ignoring a control cycle resulting from a low temperature when ahigh temperature is implemented.

The exemplary embodiments of the present disclosure have been describedwith reference to the accompanying drawings, but those skilled in theart will understand that the present disclosure may be implemented inanother specific form without changing the technical spirit or essentialfeature thereof.

Accordingly, it will be understood that the aforementioned exemplaryembodiments are described for illustration in all aspects and are notlimited, and it should be interpreted that the scope of the presentdisclosure shall be represented by the claims to be described below, andall of the changes or modified forms induced from the meaning and thescope of the claims, and an equivalent concept thereof are included inthe scope of the present disclosure.

The apparatus for post-processing exhaust gas for removing the sulfuroxides according to the exemplary embodiment of the present disclosuremay be used for removing sulfur oxides in a catalytic device when beingregenerated.

1. An apparatus for post-processing exhaust gas for removing sulfuroxides, the apparatus comprising: an input unit configured to receiveone or more elements of operation information of a vehicle among anengine operation time, an engine fuel consumption quantity, a vehicletrip distance, and sulfur oxides produced quantity; a memory unitconfigured to store a first operation information value for processingsulfur oxides and a second operation information value for processingsulfur oxides, wherein the first operation information value and thesecond operation information value are generated by evaluating theoperation information received from the input unit; a first processingunit configured to determine whether the first operation informationvalue stored in the memory unit reaches a predetermined first referencevalue, and to generate a low temperature control command when the firstoperation information value reaches the first reference value; a secondprocessing unit configured to determine whether the second operationinformation value stored in the memory unit reaches a predeterminedsecond reference value, and to generate a high temperature controlcommand when the second operation information value reaches thepredetermined second reference value; and a sulfur oxides removaloperating unit configured to remove a first sulfur oxides by heating acatalytic device under a first temperature condition when the lowtemperature control command is generated from the first processing unit,and remove the first sulfur oxides and a second sulfur oxides by heatingthe catalytic device under a second temperature condition when the hightemperature control command is generated from the second processingunit.
 2. The apparatus of claim 1, wherein the first processing unitinitializes the first operation information value of the memory unitafter the low temperature control command is generated, and the secondprocessing unit initializes the second operation information value ofthe memory unit after the high temperature control command is generated.3. The apparatus of claim 2, wherein when the second processing unitinitializes the second operation information value of the memory unit,the second processing unit also initializes the first operationinformation value of the memory unit.
 4. The apparatus of claim 1,wherein in the sulfur oxides removal operating unit, the firsttemperature condition is 400° C. or higher and the second temperaturecondition is 600° C. or higher.
 5. The apparatus of claim 1, wherein thepredetermined first reference value is smaller than the second referencevalue.
 6. The apparatus of claim 1, further comprising: a manual controlunit configured to generate the high temperature control command,wherein when the high temperature control command is generated from themanual control unit, the first sulfur oxides and the second sulfuroxides are removed by heating the catalytic device under the secondtemperature condition, and the first operation information value and thesecond operation information value of the memory unit are initialized.7. The apparatus of claim 1, wherein the first sulfur oxides includesammonium sulfate ((NH4)2SO4), and the second sulfur oxides includescopper sulfate (CuSO4).
 8. A method for post-processing exhaust gas forremoving sulfur oxides, the method comprising: an input operation ofreceiving one or more elements of operation information of a vehicleamong an engine operation time, an engine fuel consumption quantity, avehicle trip distance, and sulfur oxides produced quantity from an inputunit; an evaluating operation of generating a first operationinformation value for processing sulfur oxides and a second operationinformation value for processing sulfur oxides by evaluating theoperation information received from the input operation; a first commandoperation of determining whether the first operation information valueevaluated in the evaluating operation reaches a predetermined firstreference value, and generating a low temperature control command whenthe first operation information value reaches the predetermined firstreference value; a second command operation of determining whether thesecond operation information value evaluated in the evaluating operationreaches a predetermined second reference value, and generating a hightemperature control command when the second operation information valuereaches the predetermined second reference value; a first removaloperation of removing a first sulfur oxides by heating a catalyticdevice under a first temperature condition when the low temperaturecontrol command is generated in the first command operation; and asecond removal operation of removing the first sulfur oxides and asecond sulfur oxides by heating the catalytic device under a secondtemperature condition when the high temperature control command isgenerated in the second command operation.
 9. The method of claim 8,further comprising: initializing the first operation information valueafter the low temperature control command is generated; and initializingthe second operation information value after the high temperaturecontrol command is generated.
 10. The method of claim 9, wherein whenthe second operation information value is initialized, the firstoperation information value is initialized together.
 11. The method ofclaim 8, wherein when the received operation information is the engineoperation time, the second reference value is set to a range from 1.5times to 20 times the first reference value.
 12. The method of claim 8,wherein when the received operation information is the engine fuelconsumption quantity, the second reference value is set to a range from1.5 times to 10 times the first reference value.
 13. The method of claim8, wherein when the received operation information is the vehicle tripdistance, the second reference value is set to a range from 1.5 times to5 times the first reference value.
 14. The method of claim 8, whereinwhen the received operation information is the sulfur oxides producedquantity, the first reference value is sulfur oxides storage quantity ofa DOC or a first sulfur oxides storage quantity, and the secondreference value is a second sulfur oxides storage quantity.
 15. Themethod of claim 8, wherein the first temperature condition is 400° C. orhigher and the second temperature condition is 600° C. or higher. 16.The method of claim 8, wherein the predetermined first reference valueis smaller than the second reference value.
 17. The method of claim 8,wherein a manual control unit generating the high temperature controlcommand is further included, and the method further includes, when thehigh temperature control command is generated from the manual controlunit, removing the first sulfur oxides and the second sulfur oxides byheating the catalytic device under the second temperature condition, andinitializing the first operation information value and the secondoperation information value.
 18. The method of claim 8, wherein thefirst sulfur oxides includes ammonium sulfate ((NH4)2SO4), and thesecond sulfur oxides includes copper sulfate (CuSO4).